In the original Rome, if you wanted to see the description + stats + abilities of a unit or building you just right-click it and it's all right there in one window. In the remaster you have to click 3 times and then wait for an out-of-game wiki to load.
In the original, if you wanna see city management stuff, you just open the city management window from the city window, and there it all is, on your left, all in one window, all presented in such a way that you don't even need to read anything to understand what's happening in that city, just a quick glance at the little icons was enough. In the remaster it's all spread out in several windows all over the screen.
Family tree. In the original you just open it and there it is, the whole family. You can right-click on anybody in that tree and bring up their information window. In the remaster you have two family trees. One small one for that man's family and a larger one for ALL your generals and family members. Why does that first one even exist? It's just not needed. And why can't I right-click someone from the large family tree and go right to their information window?
In the original you could right-click your city tab to see a list of all cities in your empire. From here, if you right-clicked on a city from the list, it brought up its interaction window and you could do everything you needed to do from there, all in that window. Build, recruit, see governor stats, public order, set taxes, all in one window. In the remaster it's all over the screen. Governor is on the left, taxes are in a separate window, building and recruitment on the right, public order somewhere else... it's all over the damn place.